The discussion on the NASA forums, and the activity at the NASA events I have attended and read about would say that the Pro Sedan classes are dead in NASA. GTS, CMC, AI, AI/X, USTCC, Spec Neon, SM, the SER cup, maybe Honda Challenge -- those seem to be where most of the discussion and activity are right now. There doesn't seem to be a home for SCCA legal IT cars in NASA anymore.
Why would ther be high activity on their site for IT classes, when this one is so good?